A106912 - OEIS

A106912

Primes of the form 2x^2-xy+7y^2, with x and y nonnegative.

2, 7, 13, 73, 83, 127, 167, 173, 197, 233, 263, 283, 337, 347, 373, 503, 547, 557, 563, 607, 677, 733, 743, 787, 853, 887, 937, 953, 1033, 1163, 1187, 1297, 1327, 1427, 1487, 1553, 1583, 1597, 1723, 1777, 1847, 1913, 1933, 1987, 1993, 1997, 2053

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Discriminant=-55.

LINKS

Vincenzo Librandi and Ray Chandler, Table of n, a(n) for n = 1..10000 [First 1000 terms from Vincenzo Librandi]

N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references)

MATHEMATICA

QuadPrimes2[2, -1, 7, 10000] (* see A106856 *)

CROSSREFS

Sequence in context: A211874 A262830 A072060 * A099629 A092836 A102152

Adjacent sequences: A106909 A106910 A106911 * A106913 A106914 A106915

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 09 2005

STATUS

approved